libarc32_arduino101/Makefile: Add 'strip' target

The file libarc32drv_arduino101.a is built with debugging symbols by
default, however the version we ship needs to be stripped. The new
"strip" target makes it easy for us to strip when committing, and
the default target still behaves the same way, so the library can be
re-compiled for debugging purposes

Author: eriknyquist

system/libarc32_arduino101/Makefile

@@ -17,6 +17,7 @@ C_SRC+=$(wildcard $(PWD)/framework/src/os/*.c)
 ARCH=ARC
 CC=arc-elf32-gcc
 AS=arc-elf32-as
+STRIP=arc-elf32-strip
 RM=rm -f
 INSTALL=install
 
@@ -56,6 +57,9 @@ $(TARGET_LIB): $(C_OBJ) $(ASM_OBJ)
 	@echo "Link $@"
 	@$(AR) rcs $@ $^
 
+strip: $(TARGET_LIB)
+	@$(STRIP) --strip-unneeded $^
+
 %.o: %.S
 	@echo "Assembling $<"
 	$(CC) -c $(CFLAGS) $< -o $@